Tonight I am un-decorating the Christmas tree (never mind the 'discussion' on when twelfth night is - in my house it is 6 January), so I am drinking mulled wine. Recipe:
Sometime before Christmas, simmer orange and/or lemon peel and spices (cinnamon, ginger, allspice, cloves (not too many), bay leaf ... anything else you fancy) in water until well infused. Strain, and add to the liquid an equal volume (at least) of sugar. When the sugar is completely dissolved, bring to a simmer, then allow to cool. Put the resulting syrup in a bottle. I keep it in the fridge but I don't know if that is necessary.
Thereafter, add a small spoonful of the syrup to a glass, add half a glass of red wine (or white wine, or cider, or apple juice for a non-alcoholic version) and top up with boiling water.